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-rw-r--r--src/nvim/ascii.h8
1 files changed, 5 insertions, 3 deletions
diff --git a/src/nvim/ascii.h b/src/nvim/ascii.h
index 44ff540b40..31851a84e6 100644
--- a/src/nvim/ascii.h
+++ b/src/nvim/ascii.h
@@ -8,9 +8,11 @@
// Definitions of various common control characters.
-#define CharOrd(x) ((x) < 'a' ? (x) - 'A' : (x) - 'a')
-#define CharOrdLow(x) ((x) - 'a')
-#define CharOrdUp(x) ((x) - 'A')
+#define CharOrd(x) ((uint8_t)(x) < 'a' \
+ ? (uint8_t)(x) - 'A'\
+ : (uint8_t)(x) - 'a')
+#define CharOrdLow(x) ((uint8_t)(x) - 'a')
+#define CharOrdUp(x) ((uint8_t)(x) - 'A')
#define ROT13(c, a) (((((c) - (a)) + 13) % 26) + (a))
#define NUL '\000'